Welding structure of seamless steel rails with smooth operation up and down and large carrying capacity of welding seams

Abstract

The invention relates to a welding structure of seamless steel rails with smooth operation up and down and large carrying capacity of welding seams. The reinforced welding structure of the seamless steel rails with smooth operation up and down belongs to the technical field of welding of steel rails of trains. The welding structure of the invention comprises steel rails and welding seams, wherein the connecting parts of the steel rails are in inclined surfaces which are connected in a welding way; the inclined surfaces at the connecting parts of two parallel steel rails are asymmetrically arranged in a staggered way; the staggered length is larger than the length of a section of carriage; and each inclined surface is determined by being parallel with the y axis and forming 45 degree or 60 degree angle with the x axis. The inclined welding surfaces of the invention can prevent wheels from bumping up and down when the wheels pass through the welding seams; compared with straight welding surfaces, the inclined welding surfaces can increase the welding area, reduce pure positive tension stress and pure shearing stress, and can increase the carrying capacity of the steel rails to the wheels; and even the aluminothermic welding is adopted, the welding strength and welding reliability can also be ensured, and the aluminothermic welding can improve the welding efficiency, simplify the welding technology and save the welding cost and can be operated in an on-line way. The invention is especially suitable for welding seamless long rails of heavy load trains and high-speed CRH, and can also be used for welding seamless steel rails of urban rail trains.

Description

technical field [0001] The invention belongs to the technical field of rail rail welding of rail trains, and specifically changes the existing straight welding surface perpendicular to the longitudinal direction of the rail into an oblique welding surface obliquely intersecting the rail. Background technique [0002] Modern heavy-duty and high-speed rail trains generally adopt the overall welding technology of the rail. Since the welding surface is perpendicular to the longitudinal direction of the rail, this will inevitably produce the following adverse consequences: 1. When the wheel tread passes through the weld 4, it will bump up and down; 2. The wheel load acts on the welding surface as a pure vertical shear force, the wheel rim acts on the rail as a pure transverse shear force, and the wheel set passes through the front of the rail and acts on the rear of the rail as a pure tensile force; 3. At present, the seamless length There are some problems in the welding process...

AI Technical Summary

Problems solved by technology

[0002] Modern heavy-duty and high-speed rail trains generally adopt the overall welding technology of the rail. Since the welding surface is perpendicular to the longitudinal direction of the rail, this will inevitably produce the following adverse consequences: 1. When the wheel tread passes through the weld 4, it will bump up and down; 2. The wheel load acts on the welding surface as a pure vertical shear force, the wheel rim acts on the rail as a pure transverse shear force, and the wheel set passes through the front of the rail and acts on the rear of the rail as a pure tensile force; 3. At present, the seamless length There are some problems in the welding process used for rail welding: flash welding has high welding strength and good reliability. It is a welding process commonly used in rail welding, but the flash welding equipment is complicated, expensive, and requires high power. It is also inconvenient On-line operation, gray spots are also welding defects that are difficult to eliminate; gas pressure welding is a high-temperature oxyacetylene flame intertwined with the temperature of the heated welding joint, so it is difficult to accurately measure the real temperature of the welding joint, and the implementation and control of pressure There are also problems; the welding quality of arc welding is unstable, and the welding efficiency is low; although thermite welding does not require complicated special equipment, the welding process is simple, and it is also suitable for online welding, but the welded seam is a cast structure, and its welding strength Low, except for turnout welding, there are still applications, generally not used

4. Following the traditional rail laying method, the vertical welding surfaces of the two rails are left and right symmetrical, and the wheels act on the left and right welds at the same time, which is more unfavorable to the stability of operation and the reliability of bearing

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